Green and sustainable local biomaterials for oilfield chemicals: Griffonia simplicifolia extract as steel corrosion inhibitor in hydrochloric acid
By Ituen, Ekemini; Akaranta, Onyewuchi; James, Abosede; Sun, Shuangqin
Published in Sustainable Materials and Technologies
2017
Abstract
Abstract Mild steel (MS), {X80} and {J55} steel are commonly used in construction of oilfield line pipes, casings, tubing and storage facilities. Their corrosion behaviour was investigated in 1 M {HCl} solution in absence and presence of seed extracts of Griffonia simplicifolia (SEGS) at 303 K. Corrosion rates obtained using weight loss technique at 303 K followed the trend {J55} > {X80} > MS. Inhibition efficiency up to 91.73%, 79.78% and 75.41% for MS, {X80} and {J55} respectively at 1000 ppm SEGS. {SEGS} was spontaneously physisorbed on the steel surfaces as best described by Temkin adsorption isotherm. Electrochemical measurements also conducted in the absence and presence of {SEGS} yielded comparable results. Charge transfer resistance increased as double layer capacitance decreased due to increase in thickness of {SEGS} protective film formed. {SEGS} acted as mixed type inhibitor with anodic predominance. Scanning Electron Microscopy (SEM) micrographs of the corroded surfaces reveal efficient protection of all the metal surfaces by addition of SEGS. {SEGS} could find application as anticorrosive oilfield chemical additive for acidizing, enhanced oil recovery and well treatment fluids.